diff --git a/selfdrive/car/docs_definitions.py b/selfdrive/car/docs_definitions.py
index 77a25b11fa..5db720b8f5 100644
--- a/selfdrive/car/docs_definitions.py
+++ b/selfdrive/car/docs_definitions.py
@@ -149,7 +149,7 @@ class CarParts:
     return copy.deepcopy(self)
 
   @classmethod
-  def common(cls, add: Optiona[List[EnumBase]] = None, remove: Optiona[List[EnumBase]] = None):
+  def common(cls, add: Optional[List[EnumBase]] = None, remove: Optional[List[EnumBase]] = None):
     p = [part for part in (add or []) + DEFAULT_CAR_PARTS if part not in (remove or [])]
     return cls(p)